Electric cooking device.



in E. SARGENT.

Hmmm Ummm DEVI@ APLIGATIOH FILED MAY 20A `1 Sep'. 3, 23.913.

.SEZET-SHEET l.

CHARLES E. SARGENT, OF CHICAGO. ILINOIS.

ELECTRIC COOKING DEVICE.

Application led May 20, 1911.

Be it known that I. CitanLns E. SARGENT, a citizen of the United States, residing at Chicago. in the county ot' Cook and State of Illinois, have invented a new and useful ImprovementI in Electric Cooking Devices, ot' which the following` is a specification.

My invention relates to certain new and useful improvements in electric cooking devices, and is fully described and explained in the specification and shown in the accompanying drawings, in which:

Figure 1 is a vertical section through my improved device; Fig. 2 is a horizontal s'ection on the broken line 2 otI Fig. 1; Fig. 3 is a radial section on the line 3 of Fig. 2; Fig. 4i is an elevation ot the switch mechanism and Fig. 5 is a diagrammatic View of the circuit.

Referring to the drawings, G is the outer and 7 the inner wall ot a double walled case or cooker proper. the two walls being insulated by a suitable insulating material, such as mineral wool or the like, and connected at the top by an annulus 8, in accordance with common practice in tireless cooking' constructions.

t) is a cover ot metal fitting tightly to the lower section and provided with a suitable insulation in accordance with common practice.

10 is an electrical heating element placed at the bottom of the cooker proper, as illustrated. rllhis heating element may be ot any desired form common in the art, its particular arrangement having no bearing upon my present invention.

l1 is a tube connecting the inner and onter walls of the cooker and attording a passageway ;tor the electric-wires which supply cnrrent to the heating element. l

Between the walls of. the cooker proper is a chamber 12 lying well within the outer wall so as to be thoroughly insulated from the outside air and in position to be affected by the heat in the cooker proper by conduction through the inner wall. This chamber 12 contains a hollow expansible air-diaphragm 13, one wall of which is attached to the inner wall 7 of the cooker and the opposite wall of which carries a pin 14 which extends outward through a tnbe 15 to the outside of the cooker. The outer end of the pin 1-1: is adapted, as it moves outward, to engage a screw on an arm 16 of a bell-crank lever 17 pivoted on a pin 18. Upon the same Specification of Letters Patent.

ltatentcd Sept. 2, il 5l] 3.

Serial No. 628.442,

pin is pivoted a hook 19 carrying an adjustingscrew 20, which is adapted to be cngaged by an arm 21 on the bell-crank lever 17 as the same is moved. The outer end of the hook 1t) engages the upper endot' a switch-lever carrying a contact piece 23 adapted to engage two contact plates 24 and The contact plate 24 is connected to one end of the heating element and the other end of the heatingelement is connected to one terminal of a socket QG. lThe contact plate is connected, as illustrated in Fig. :3, with the other terminal of the socket 2G. Thus, when the socket is wired to a source ot electric current and the switch-lever 22 is elevated so that the contact piece 23 connects the contacts and 25, the current will tiow through the heating element in an obvious manner. As the temperature inside of the cooker rises, the air-diaph 'agm 1? will expand forcing the pin 11 outward and rotating the bell-crank lever 1T on its axis so that the arm Q1 will presently engage the screw Q0 ot the hook 19, freeing the same from the end of the switch-lever so that the natnral elasticity of the contact piece 23 assisted by gravity will cause the switch-lever to swing downward, breaking the circuitt/ The apparatus is set so that it will antomatically break its circuit at any desired point in the following manner. The spindle ot' the bell-c 'ank le er 17 carries an indicating needle '27, which cooperates with a temperature scale 25%. ln setting the device. this needle is moved by hand to that point where it is desired to have the 'turther flow ot curcrank lever, the hook will obviously release the switch-lever at just that point determined by the previous adjustment. .In this wa)vv it is made perfectly certain that the How ot current will be cut ott at. the proper temperature and there is no danger that the contents ot the cooker will be cooked too much.

l am aware that it has heretofore been proposed to build inclosed cookers with an electric heating element, and -that efforts 4have been made to incorporate a thermosarily cross the cooking space is absolutely out of the questi-on becausevtlie food could not be placed in and removed from the cooker with such a device in use. The device mustbe wl'iolly concealed and protected from the deleterious ei'i'ects of food which may b'e spilled upon it. It must be simple, absolutely .unfailiiig in its ac vion and capable ofadjustments by those i-.vliolly unverscd in mechanics. lfhese various problems and requirements malte it impossible to select Aany ordinary 'therniostatic device in use and apply it to a device of this character, but on the4 contrary as fa r as I am aware, they make the present thermostatic device broadly considered the only practical type.

I am aware that considerable variation is possible in the details of the mechanical construction here set forth, without departing from the spirit of my invention and I therefore, although I have fully described the present form in detail, do net intend to be limited thereto, except as pointed out in the following claims in which it is my iiiteiition to claim all the novelty of the present device as broadly as .the state of the art will permit. I

I claim as new ters Patentl. In combination, insulating walls inclosing a cooking chamber, an electrical-heating element within the cooking chamber, a recess in one of the walls of the chamber, a hollow gas-containing box in said recess and exposed tothe heat within the chamber and insulated from the atmosphere, an electrical-switch and connections between one wall of the box and a switch for opening the saine. i

2. Iii cciiibiiiation, insulating walls inclosing a eificking chamber, an electricalheating element for supplying heat to the chamber, an electrical-switch device controlling the flow of current through said and desire to secure by Let- 'lieatiiig element, a hollow gas-containing box having one wall lixed in position in a 4recess in one of the chamber-walls and eX- the atmosphere, *and` adjustable connections' between another wall of the hollow gas-colitaining box and the electrical-switch device." 4. In combination, insulating walls -inclosing a cooking chamber, an electrical-heating element for supplying` heat to the chamber, hollow gas-containing box supported in a recess in one of the walls and having a thrust-rod extending from one of its walls without the chamber, an electrical-switch dovice, a latch for holding this switch device normally closed, and connections between the thrust-rod and the latch'.

5. In combination, insulating walls inclosing a cooking chamber, an electricalheating element for supplying heat to the chamber, a hollow gas-containing box supported in a recess iii one of the walls and having a thrust-trod extending from one of its walls without the chamber, an electrical switch device, a latch for holding thel switch-device normally closed. and adjust-- able connections between the thrustlrod and the latch. i

6. In combination, insulating walls inclosing a cooking chamber, electrical-heating element for supplying heat to the chainber, a hollow gas-containing box supported in a recess in one of the walls and lhaving a thrust rod extending from' one ofits walls -without the chamber, an electrical-switch device, a latch for holding the switch-device normally elosed, a bell-crank lever contacted by the thrust-rod and an adjusting screw en the latch to be str uck by the bellcrank lever in its movement for the purpose set forth. Y

In testimony whereof I hereunto set my hand this 5th day of May, 1911.

CHARLES E. SRGENT.

In the presence of two subscribing witnesses':

J. Gr. ANDERSON, R. A. Soi-inmune 

